git: openjdk/loom: fibers: Left in debug code.

[duke]

Changeset: 58d0c834
Author:    Coleen Phillimore <coleenp at openjdk.org>
Date:      2021-06-24 21:55:31 +0000
URL:       https://git.openjdk.java.net/loom/commit/58d0c834a321414d8d7f35afc5d631c12a65c93f

Left in debug code.

! src/hotspot/share/runtime/thread.cpp